Chloroprene cable binding sleeves from Hellermann in a range of sizes and colours. Temperature range -65 Degrees Celsius to +95 Degrees Celsius. Easily expand to at least 75% above bore size, breaking point substantially larger. Priced and sold in packs. The required Hellerine lubricant is a mineral oil to lubricate sleeves and allow them to slide smoothly over wires (sold separately).
An expander tool and a suitable lubricant are available separately. See HELLERMANN CABLE BINDING SLEEVE EXPANDER TOOLS AND LUBRICANTS.